fastapi.md

✅ FastAPI 시작하기

1. 공식문서
2. FastAPI 설계 및 구현
3. FastAPI 서버 실행

1. 공식문서

"FastAPI is a modern, fast (high-performance), web framework for building APIs with Python 3.8+ based on standard Python type hints." (link)

• Fast: Very high performance, on par with NodeJS and Go (thanks to Starlette and Pydantic). One of the fastest Python frameworks available.
• Fast to code: Increase the speed to develop features by about 200% to 300%. *
• Fewer bugs: Reduce about 40% of human (developer) induced errors. *
• Intuitive: Great editor support. Completion everywhere. Less time debugging.
• Easy: Designed to be easy to use and learn. Less time reading docs.
• Short: Minimize code duplication. Multiple features from each parameter declaration. Fewer bugs.
• Robust: Get production-ready code. With automatic interactive documentation.
• Standards-based: Based on (and fully compatible with) the open standards for APIs: OpenAPI (previously known as Swagger) and JSON Schema.

2. FastAPI 설계 및 구현

• Quick Start

  • 메인스크립트 작성

    # main.py
    
    from fastapi import FastAPI
    
    app = FastAPI()
    
    @app.get("/")
    async def root():
        return {"message": "Hello World"}

  • 라이브 서버 실행

    $ uvicorn main:app --reload
    
    INFO:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
    INFO:     Started reloader process [28720]
    INFO:     Started server process [28722]
    INFO:     Waiting for application startup.
    INFO:     Application startup complete.

  • 브라우저 주소창에 http://127.0.0.1:8000/ 입력

  • 아래 JSON 응답 확인

    {"message": "Hello World"}

3. FastAPI 서버 실행

• API 구현완료 테스트
  • Postman 활용
    • 메인으로 작성한 스크립트 파일(.py) 먼저 터미널에서 실행
    • GET / POST Request 타입 선택
    • URL 입력
    • POST Request 라면, body 에 보내려는 JSON 데이터 입력
    • [send] 버튼 클릭
  • API 문서 화면에서 테스트
    • Swagger UI
      • http://127.0.0.1:8000/docs
    • 다른 방법
      • http://127.0.0.1:8000/redoc